A Temperature-Decay Method for Determining Superinsulation Conductivity
The purpose of this paper is to describe a novel transient method for determining the thermal conductivity of practical layups of superinsulation* and to report the results of some early testing. This method has the advantage of permitting large-area sample tests for lower cost than standard methods, while allowing a range of boundary temperature conditions. Interest in advanced versions of the Apollo service module and studies of advanced Saturn boosters have common requirements for superinsulation. The Saturn uses involved liquid-hydrogen boundary temperatures, while the Apollo applications were for thermal control at near-ambient temperatures. A common test method was desired to cover the wide ranges of boundary temperatures, up to +200°F on the high side. The temperature-decay calorimeter has been used to perform tests for both applications with the result that new methods for support and attachment have been compared along with a screening of material concepts.
KeywordsTest Configuration Butt Joint Sink Temperature Union Carbide Corporation Performance Thermal Protection
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